Was going to post a new thread when I found this one. So here goes.
I am off on a trip to the UK in 3 weeks time. My return home starts in London with a BA flight to Berlin. That's been booked with BA direct (Economy Class). I will then have about 6 hours layover at Tegel before a Qatar flight to Singapore in Business Class. That was booked via Qantas using FF points.
Given that BA and Qatar are Oneworld airlines, would BA be able to check my bag through to Singapore even though my flights are on separate tickets? It would save me having to clear immigration, collect my bag and then check in again.
However I have now just seen that Qatar use the BA lounge at Tegel, and it is landside, so unless I can do online check in and find access to a printer to print a BP, I will still need to check in with Qatar anyway. Trying to do things the cheapest way and still get some comfort for the night flight didn't quite work out this time!